Urethane foam reinforcing material

Abstract

A reinforcing material for urethane foam effectively protects a molded urethane foam body and suppresses fricatives with a metal spring, having high productivity and excellent handleability and being applicable to a molded urethane foam body with highly uneven shape at low cost. It is a reinforcing material for urethane foam wherein a nonwoven fabric A having single fiber linear density of 1.0 to 3.0 dtex and a nonwoven fabric B having single fiber linear density of 0.5 to 2.5 dtex are laminated by needlepunching process by inserting needles from a direction of the nonwoven fabric A with a needle density of 35 to 70 needles/cm 2 .

1. A reinforcing material for urethane foam wherein a nonwoven fabric A having single fiber linear density of 1.0 to 3.0 dtex and a nonwoven fabric B having single fiber linear density of 0.5 to 2.5 dtex are laminated by needlepunching process with a needle density of 35 to 70 needles/cm 2  by inserting needles from a direction of nonwoven fabric A. 
     
     
       2. The reinforcing material for urethane foam according to  claim 1 , wherein the nonwoven fabric A has an initial modulus of 10 to 100 N/5 cm and elongation of 2 to 50% while the nonwoven fabric B has an initial modulus of 30 to 200 N/5 cm and an elongation of 5 to 50%. 
     
     
       3. The reinforcing material for urethane foam according to  claim 1 , wherein the nonwoven fabric B contains carbon black in an amount of 0.5 to 5% by weight. 
     
     
       4. The reinforcing material for urethane foam according to  claim 1 , wherein the nonwoven fabric A has an initial modulus of 10 to 100 N/5 cm and elongation of 2 to 50% while the nonwoven fabric B has an initial modulus of 30 to 200 N/5 cm and an elongation of 5 to 50%, and contains carbon black in an amount of 0.5 to 5% by weight. 
     
     
       5. A reinforcing material for urethane foam, comprising a three-layer structure having a nonwoven fabric A with single fiber linear density of 1.0 to 3.0 dtex as an outer layer and a nonwoven fabric B with single fiber linear density of 0.5 to 2.5 dtex as an inner layer laminated by needlepunching process with a needle density of 35 to 70 needles/cm 2 . 
     
     
       6. The reinforcing material for urethane foam according to  claim 5 , wherein the nonwoven fabric A has an initial modulus of 10 to 100 N/5 cm and elongation of 2 to 50% while the nonwoven fabric B has an initial modulus of 30 to 200 N/5 cm and an elongation of 5 to 50%. 
     
     
       7. The reinforcing material for urethane foam according to  claim 5 , wherein the nonwoven fabric B contains carbon black in an amount of 0.5 to 5% by weight. 
     
     
       8. The reinforcing material for urethane foam according to  claim 5 , wherein the nonwoven fabric A has an initial modulus of 10 to 100 N/5 cm and elongation of 2 to 50% while the nonwoven fabric B has an initial modulus of 30 to 200 N/5 cm and an elongation of 5 to 50%, and contains carbon black in an amount of 0.5 to 5% by weight.